R language survival analysis

Survival analysis involves predicting when a particular event will occur . It is also called time to failure analysis or time to death analysis . for example , Predict the survival days of cancer patients or predict the time of mechanical system failure .

be known as survival Of R Packages are used for survival analysis . This package contains functions Surv(), It takes the input data as R The formula , And create a survival object in the selected variable for analysis . Then we use the function survfit() To create an analysis diagram .

Installation package

install.packages("survival")

Law
stay R The basic syntax for creating a survival analysis in is -

Surv(time,event)
survfit(formula)

The following is a description of the parameters used -

time Is the subsequent time before the event occurs .

event Indicates the status of the expected event .

A formula is the relationship between predictive variables .

Example
We will consider the existence of a package named “pbc” Data set of . It describes primary biliary cirrhosis (PBC) Patient survival data points . In the many columns that exist in the dataset , Our main concern is “ Time ” and “ state ” Field . The time represents the number of days between patient registration and the early stage of the event when the patient received a liver transplant or died .